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Leveling deck

Our deck is currently pitched towards the house, causing water to shed towards the house rather than away. The deck structure consists of the posts in concrete, sistered 2x6"s strapped to the tops of the posts and finally 2x6's framed together to create the support for the deck boards. There is not much of the posts sticking out of the ground or I think we would cut all the posts even, but some of the posts are close to the house and it would be difficult to get a clean, flat cut.
Would it be wise to "notch" the support joists on top of the posts in order to create a flat deck? In some cases I might have to cut a 3" notch. Would adding 2x6's on both sides add structural integrity to make uo for what was lost by notching?
I don't want to dig all new holes so looking for a solid work around. Of course, I am not sure if the deck is sinking or just built by idiots!!
Hopefully if you have read all of this you have an answer!!